KDV21 signal loss

The tech support has recently latched on to the SIM card solution didn't mention why but they asked me to locate and remove the SIM and then reinsert it and power the unit back on.. I guess hoping it was not quite seated or that you would accidentally clean the contacts during the process?? .. No heat issues here nor any visible issues with the SIM and this would be the second SIM with the same problem in my case .. Today went a lot longer without issues but every 3-4 hours with a disconnect is still well beyond acceptable. Did notice that the SIM part came up on my last two support calls .. and had not heard that before.. TMobile seems to be fumbling for the cause as well or at least the support have started throwing the proverbial spaghetti at the wall….